mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure. The specimen appears massive and rough, with minor iron staining.
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Physical properties
Typically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure. The specimen appears massive and rough, with minor iron staining.
Formation & geological history
Forms when silica-rich fluids cool in veins, cavities, or pegmatites; it may also crystallize during metamorphism. Quartz is common from Precambrian rocks to the present day.
Uses & applications
Used in glassmaking, ceramics, foundry sand, electronics, abrasives, and engineered stone; attractive pieces are collected or carved, though milky quartz is generally not a high-value gemstone.
Geological facts
Its cloudy appearance results from microscopic fluid inclusions, fractures, or trapped minerals scattering light. Quartz is one of Earth’s most abundant and chemically resistant minerals.
Field identification & locations
Identify it by its hardness— it scratches ordinary glass—lack of cleavage, pale translucent body, and irregular conchoidal fracture. Common worldwide in granite, pegmatite, hydrothermal veins, and metamorphic rocks.
